807 research outputs found
PBr3 adsorption on a chlorinated Si(100) surface with mono- and bivacancies
For the most precise incorporation of single impurities in silicon, which is
utilized to create quantum devices, a monolayer of adatoms on the Si(100)
surface and a dopant-containing molecule are used. Here we studied the
interaction of a phosphorus tribromide with a chlorine monolayer with mono- and
bivacancies in a scanning tunneling microscope (STM) at 77 K. The combination
of different halogens in the molecule and the adsorbate layer enabled
unambiguous identification of the structures after PBr3 dissociation on
Si(100)-Cl. A Cl monolayer was exposed to PBr3 in the STM chamber, which allows
us to compare the same surface areas before and after PBr3 adsorption. As a
result of this comparison, we detected small changes in the chlorine layer and
unraveled the molecular fragments filling mono- and bivacancies. Using density
functional theory, we found that the phosphorus atom occupies a bridge position
after dissociation of the PBr3 molecule, which primarily bonds to silicon in Cl
bivacancies. These findings provide insight into the interaction of a dopant
containing molecule with an adsorbate monolayer on Si(100) and can be applied
to improve the process of single impurities incorporation into silicon
The influence of nanoparticles on biological objects
The modem opportunities o f medical care are basing on usage of new methods of diagnostic and treatment, including nanotechnologies and nanoobjects in clinical medicine and pharmacology. The experiment was carried out on 58 rats. The nanoparticles of iron oxide were used intranasally and by application on skin in kind of suspension. The methods were used: light, transmission, electron, probe and scanning microscopy with microelement analysi
Role of real-world evidence studies in cardiology
The introduction of evidence-based medicine into practical healthcare provides physicians with the opportunity to use treatment approaches, which have been proven to be effective in randomized controlled trials. In this case, it is necessary to consider using the medication in a particular patient in accordance with the design of clinical trials and strictly follow the instructions. Drugs should be critically selected with focus on quality of available efficacy and safety data obtained in the population closest to a patient. In addition, clinicians should regularly review the available data with particular regard to its quality. The advantages, disadvantages, limitations and methodological problems of observational studies should be carefully considered during the interpretation of results. At the same time, the compliance of the results of real-world evidence studies with registration trial data indicates a high reproducibility of medication effects
Renal Function Protection as an Important Component of a Comprehensive Approach to the Management of Patients with Atrial Fibrillation
The increase in the life expectancy of the population is accompanied by an increase in the prevalence of diseases for which old and senile age are risk factors. Atrial fibrillation (AF) and chronic kidney disease (CKD) are two diseases that can coexist in a patient. The risk of ac thromboembolic and hemorrhagic events in this case increases due to the mutual aggravating influence of these diseases. In addition, these patients have a high incidence of coronary events, and cardiovascular complications are the main cause of death in patients with AF and CKD. Consequently, such patients require an integrated approach to treatment, and their management is a complex clinical task. The direct oral anticoagulant rivaroxaban has been most studied in a population of comorbid AF and CKD patients and has proven a high efficacy and safety profile in these patients in randomized controlled trials. In addition, rivaroxaban has shown a significant reduction in the risk of myocardial infarction in various patients, as well as the possibility of preserving renal function to a greater extent compared with warfarin therapy, and a possible positive effect on reducing the risk of cognitive impairment. A single dosing regimen can improve adherence to treatment, which is one of the key conditions for achieving the above effects. Thus, these factors make it possible to achieve comprehensive protection of comorbid patients with AF and CKD
Issues in the study of utero-placental blood flow in severe gestosis
The complications of pregnancy, gestosis particularly, are still important aspects on the modern stage of development of obstetrics, as it influences on development of maternal and perinatal morbidity and mortality. One hundred and twenty-five patients with severe gestosis were studied. The conditions of myometrium, endometrium, placenta, umbilical chord as well as erythrocytes of maternal blood were explored with help of atomic power microscopy, light microscopy as well as electron microscop
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